the nsa says it's entirely legal but privacy advocates say it's unnecessarily intrusive. tamron. >> thank you very much. >>> well, a deadly attack on the defense mintry in yemen this morning. the attackers were said to be wearing yemeni army uniforms. dozens were killed or wounded. no claim of responsibility as of yet. >>> despite pleas from families and investigators they not be released. officials in connecticut on wednesday did make public more than 20 minutes of 911 calls that came in during last year's shooting at sandy hook elementary school. the calls urged police to come quickly. in some calls shots can be heard. in one, a teacher shot in the foot told police there's children in this room. overall, the tapes show calm, bravery and professionalism. nbc news has made a decision out of respect for the families not to play those tapes. >> we should talk about that for a second more. we are coming up on the one-year anniversary of the shootings. the families said please to media outlets, don't play the tapes. our policy, the decision was made based on this idea that if